Tube-reducing mill.



R. E. BROCK: TUBE REDUCING MILL. APPLICATION man 25.21. 19m.

Patamed Jan. 2, 1917.

6 SHEETS-SHEET I.

R. E, EEOCK. TUBE REDUCING MILL APPUCATION FILED FEB.21, new

Eatented 2, 193.1 5

"R. E; BROCK.

TUBE REDUCING MILL.

APPLICATION FILED 55.21, I916.

Patented J an. 2, 1917.

6 SHEETS-SHEET 3.

w} Wizwesaes: fnavenfir:

n. E. BROOK.

TUBE REDUCING MILL.

. APPucAHoN FILED FEB.21. I916.

Patented Jan. 2, 191?.

6 SHEETSSHEET 4.

%fm@$@@@: Emawmfhr:

R. E. BROCK.

TUBE REDUCING MILL.

APPLICATION FILED 5.2:, 1916.

Patented J an. 2, 1917.

s SHEETS-SHEET 5.

fy fweessm: ma ewf'bm' R. E. BROCK.

TUBE REDUCiNG MILL.

APPLICATION FILED FEB-2!, 1916.

L1 Q Patented Jan. 2, 1917.

6 SHEETSSHEET 6,

RICHARD E. BROOK,

OF CANTON, OHIO.

TUBE-REDUCING MILL.

Specification of Letters Patent.

Patented Jan. 2, 1917.

, Application filed February 21, 1916. Serial No. 79,587.

To all whom it may concern Be it known that I, RICHARD E. BROOK, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented certain new and useful Improvements inTube-Reducing Mills, of which the following is a specification.

My invention relates to an improved mill for'rolling seamless tubing.

The object of the invention is to provide rapid and efficient means for. manufacturing seamless tubing, in which the blank maybe continuously treated by a series of reverse rolling operations, under a single heat, back and forth between the same set of cross rolls, whereby to treat it successively in a. rapid, practically continuous manner, without the necessity of manual handling of the tube in process.

Other objects of the invention are to provide means whereby the operation of piercing, reducing and smoothing the walls of the pierced tube or blank, to either increase or decrease the diameter and accurately gage the size ofthe tube by successive operations, may be quickly and efficiently performed.

Generally stated, the mechanism comprises means for. introducing the blank, either solid, when the piercing operation is utilized, or in the form of a hollow blank for successive treatment and finishing, in COI1I1Ct1QIl-W1th a suitable mandrel and nshin mechanism between a air of cross rolls so'mounted as to provide for the reversal of the position for each alternate pass. Also means for guiding the blank in its progress toward and from the cross rolls; means for reversing theblank and reintro=, ducing it between the rolls by the same end which was last treated; means forretaining the blank between the rolls, and for adjusting such retaining means; means for adjusting the cross rolls themselves, and for swivelly mount-ing and tilting them; and various other features and details of construction as shall be more fully hereinafter de-' scribed.

In carrying out the manufacture of seamless tubing by my improved mechanism, it

is essential that the cross rolls shall be quickly reversed, thereby correspondingly reversing the feed of the blank or tube in process, whereby it can be passed back and forth until the several required operations are performed without loss of time or necessity of attendant labor, the various adjustments being quickly and easily performed, certain of such adjustments being made independent of others, under the control of the operator. 4

In the drawings, which illustrate one preferred embodiment of the invention,-Figure 1 is a view showing the cross rolls in operative position in their housing frame,

' and the driving mechanism therefor, at one side-of the frame. Fig. 2 is a plan View, partly in section, of Fig. 1. Fig. 2 is a detail plan view showing the blank pushing mechanism at each side of the cross roll.

Fig. 3 is a crosssectional detail View, indicated ,by the line III. III. of Fig. 1. Fig.-

4-. is an enlarged plan view of the cross roll housing and the accompanying adjusting and actuating mechanism for the several parts. Fig. 5 is a sectional elevation of the cross roll housing frame and the several parts, partly in section, indicated by the section line V. V. of Fig. 4. Fig. 6 is a vertical cross section through the cross roll housing frame, certain parts being omitted, and indicated by the section line V1. VI. of Fig. 5. Fig. 7 is a similar view, indicated by the section line VII. VII.'of Fig. 5. Figs. 8, 9, 10 and 11 are diagrammatic sectional detail views illustrating successive steps of operation.

In the operation of rolling by my improved mechanism, the blank, whether solid as originally pierced, or hollow, either with or without a mandrel, is designed to j be passed horizontally between two cross reducing rolls 2, 2, arranged for operation at opposing angles, as is usual in cross rolling but mounted by their journals 3 at each en in bearings 4, 4, of a tilting frame 5, one for each cross roll?" Each of said tilting frames is pivotally mounted, as by a stud or gudgeon 6 extending sidewise of the middle a, slidable carrier. frame or cross head 7. Each of said cross heads 7 1s shdably mounted by its base upon the upper faces 8 of thelower main crossmembers 9, 9, of themain housing frame, which itself is mounted upon the foundation members 10 of the mill. Each frame 7 is likewise mounted at its upper portion "slidably in runways 11 of the upper main side members 12 of the mam horizontal frame, by which means frame7 is capable' of being moved inwardly or outwardly toward or from the working pass of the blank, indicated at a, Fig. 5.

Each jtilting frame 5 is provided at its upper portion with a segmental toothed rack 13, 13', engaging a worm 14, 14" of 'shaft'15 journaled in bearings 16, 16; and

16 16, mounted upon and slidable with the sliding frame 7.

Shaft 15 is provided at one end with a beveledgear 17 engaging a driving bevel "18' slidably mounted on a splined or squared shaft 19 having a rotatable bushing 20 re 29 in one direction or the other, at whatever position frame 7 may be located toward or from the central pass of the mill, worm 14 will be correspondingly actuated, throwing tilting frame 5'in one direction or the other and positioning the cross roll 2 correspond 'ingly at the proper inclination. It will be understood that the other companion cross roll 2, being constructed and mounted in the same manner and provided with similar actuating 'mechanism, is arranged to operate 'simultaneouslylwith the cross roll just described, through its similar mechanism, but in the: opposite direction. For such purpose,'theshaft '19 is extended over to the other side, and by a bevel gear 18' engaging a bevel gear 17, similar to bevels 18 and 17,

but operating as to bevel 17 in the reverse direction worm 14 at the other side of the centerengaging segmental gear teeth 13 of the opposite tilting frame 7, will effect the desired movement. By this means, each tilting frame is alternately actuated in the opposite direction, changing the inclination of the cross rolls with relation to each other,

it being understood that the cross rolls are.

continuously driven in the same direction.

Frame 7 is provided on the upper side of its base with a bearing shoe 32, against which rides a co-acting bearing shoe 33 of tilting frame respectively.

the tilting frame 5, said shoes meeting by their arc-shaped faces defined by a radius struck from the axial center of the tilting frame trunnion. By this means the bearing shoes provide a positive support for the frame at its various positions. the stationary shoe 32 and movable shoe 33 each being fixedly connected with the frame base and Tilting frame 5 is also provided with limiting abutments 34, 34, adapted to engage limiting bearing faces35, 35, respectively of the frame 7, so as to positively terminate the tilting action in either direction. Any suitable commutator or controlling mechanism for motor 29 may be utilized whereby to control its operation within the desired periods necessary to actuate the tilting frame alternately to the desired degree, as will be readily understood. It will be also understood that each'of the cross rolls 2 is driven in the same direction continuously, as stated, and as indicated in the diagrammatic views, Figs. 8 to 11 inclusive.

The journal of each cross roll 2 is provided with a coupling terminal 36 having a universal joint bearing socket 37 engaged by an inter-fitting terminal 38 of a driving shaft 39, one such shaft and coupling terminal being provided for each cross roll, as shown in Figs. 1 and 2.

Each of shafts 39 is provided at its opposite end with a similar coupling terminal 40 in universal joint connection with coupling terminal 41 of driving shaft 42, each shaft 42 being mounted in bearings '43, 43. v

of the gear housing 44. By this means I provide between the cross rolls and shafts 42 the oscillating coupling shafts 39, whereby the cross rolls are continuously driven during the tilting movement of their frames '5, through the universal joint mechanism described or any other suitable joint providing for universal movement. 1

Each shaft 39 is preferably provided with a supporting yoke 45 engaging the underside of the shaft between collars 46, 46, each yoke being connected by connecting rod or bar 47 with levers 48 pivoted 'at 49, and having the series of compensating counterweights 50. By this. means the shafts 39 are automatically supported at their varying vertical positions. Each driving-shaft 42 is provided with one or more toothed gears 51 in driving engagement with pinions 52 of a main drive shaft 53 mounted in suitable hearings in gear housing 44,- and also pro vided with a coupling terminal 54, in universal joint connection with a main driving shaft 55, or otherwise connected with a prime mover.

At one side of the cross roll housing, terminating closely adjacent to the pass of the cross rolls andin axial alinement with the working center therebetween and of the tube injzprocess, I provide a guide trough trough and-pusher mechanism may be utilemon 56'whiclr maybean'fopen trough, as shown,

= adapted to receive the blank and to the passiof thecrossiiiplls, or whichmaybe wholly or' partially elosed, ;.as desiiedi'- Trough-56' is'mountedand supported by any suitable meansf in proper position; imidway" .betweenthe shaft's89, and is provided with suitable, I 7 preferably 1 adjustable, s upporting mechanism, as one or more jstandards 57 having threaded engagement" with holding nuts-"58 'in frame 59, which may: convenientlybe made as a portion of the counterweight supportingframe." Itjwill be-understood that at the other side of the pass of the cross "rolls, any suitable "supporting lized for supporting and re-introducing the blank or tube inprocess by its lastt'reated end again to'the cross rolls, after they have .j been'again tilted.

For the purpose'of so pushing the blank into the nip of the cross rolls, I provide at one, and preferably both sides of the cross rolls, as shown in Fig. 2, a longitudinally vtraveling pusher 60 on the end of plunger v 61- having a supporting cross head 62 in; sup

" porting sliding engagement with an-upper beam 63, adapted to maintain the pusher in centralized position at all points longitudinally iof "its travel. A spring cushioned buffer 63 is adapted to provide a limiting stop for cross head- 62. Plunger 61 extends" through stuffing. box 64into a cylinder 65 mounted in bearings66, 66, of the gear housing 44 midway between shafts-42, and in alinement with trough 56, cylinder 65 being provided with suitable actuating fluid con- 'n ections and valved mechanism, not neces- .40

sarily herein illustrated or described, whereby the plunger =61 may be actuated positively inone direction or the other for thrusting the blank positively toward the 7 cross rolls and for receding the plunger for as shown.

another operation, the cylinder being fixedly held in bearing 66 by a stuffing box gland,

Said stuifing box has nonecessary function as a fluid packing, and is :merely utilized as a convenientmeans for tightly holding cylinder 65 in place,

Mounted centrally below the normalpass of the blank and between the cross rolls 2 is an anvil pedestal or support 67 havingan anvil 68 capable of removal and substitution, depending upon the desired bearing surface of the anvil, whereby to support the blank during the reducing operation, immediately below the working position of the cross rolls.

For the purpose of providing an upper bearing for the blank, in the same relative position with relation: to the cross rolls and blank above such working position, I providea bearing roller '69, mountedby its journals 70 in bearings 71 of a vertically movableframe 72. Said, frame is carried at each gbtherwlse, upon vertically reciprocablefad' ijiis'table fcrossfheads. 74, one at each side of transversecentr'al plane of the cross iroll'housing, andslidably movable in downy supporting pin connections or within the housing framing and connected at its .lower'end, as indicated at 78, with the cross head '74.

Each screw or threaded stem 76 is in splined or squared engagement at its upper end, as indicated at 79, with gear wheel 80, each of said gears 80 intermeshing with an actuating pinion 81 on the end of shaft 82 mounted on a middle bearing 83 between-the upper housing members 12' and carrying at its lower end a bevel wheel 84. Said bevelwheel is in driving'engagement with a similar bevel wheel 85 of shaft 86, which extends across the upper portion of the cross rollhousing and is mounted at'each end p012 tion within suitable bearings 87 and 88 respectively, and in a suitable bearing 89 at one or both sides of bevel gear 85. Shaft 86 is provided at each end with a bevel gear 90 in driving engagement with a similar bevel 91 on the upper-end of shaft 92 carried in bearings 93, 94, at each end portion ofthe housing frame. I

. Mounted-by its hub in lower bearing 94 and freely rotatable around the lower end of shaft 92 is a bevel gear95 in engagement with a driven bevel gear '96 keyed or otherwise secured to shaft 97 carried in bearings 98, 98, ofa cross frame 99. J The upper end of the hub of bevel gear 95'is provided with a clutch face adapted to be operatively connected with a vertically movable clutchlOO capable of being raised out of engagement by a suitable actuating clutch lever 101, and

- against the pressure of spring; 102, by which it is thrust into clutchingoperative connection with gear .95, clutch 100 being in splined engagement with shaft 92.

Keyed upon-shaft 97 is a pinion 103 which intermeshes at each side with gear wheels 1041, 104, each of said gears being in splined engagement with a threaded thrust shaft 105. Said shaft extends through hub 106 of gear 104:, which is suitably mounted against I longitudinal movement in the main housing, and shaft 105 by its threaded portion engages a nut 107 fixedly mounted within the main housing frame,'and is connected, as indicatedat 108, with the'horizontal slidable frame '7. There being as thus arranged a pair of shafts 105 engaging the slidable frame 7 at each side of its middle portion & 1,211,070

andthus operating together in one direction or the other, depending upon the operation'of the actuating motor, frame 7 may be positively, accurately and graduallymov'ed inwardly or outwardly.

It will be understood that both frames 7, by similar screw mechanism at each side, may be thus moved toward or from each other together, or that either may be adjusted individually.

- For the purpose of driving shaft 86 and its connected parts, to-wit, the bearing roll.- ers 69 and frames'7, through the gearing above described, shaft 86 is provided with a worm gear 109 located between bearings 87 and in driven engagement with a worm 110 mounted by its journals 111, 111, in bearings 112 of an upper surrounding coping frame 113. WVorm 110 is connected by coupling 114 with motor 115, also provided with suitable controlling mechanism, as will be readily understood. By this means it will'be seen that shaft 86 may be driven 'in either direction, either to raise orlower rollers 69, and to advance or recede the adjustable frame 7 Also that the rollers'69 may be adjusted independently of the adjustment of frames 7 by throwing out the clutch 100.

j In'Figs. 8 to ll inclusive of thedrawings, I'have illustrated diagrammatically some of the operations which may be performed by the foregoing mechanism. In Fig. 8 I show the'initial or piercing operation'. when employed, in which piercing point I) on the end of mandrel bar 61 is maintained in position centrally between the cross rolls 2, 2, and in opposition to the advancing blank a, as is usual in such operations. In Fig. 9 I show a reducing or finishing point a similarly ,mounted on mandrel bar 61 between cross rolls 2, 2, which are adjusted with relation to pointv c to properly reduce the wallsof the tube-in-process. In Fig. 10 the tube-inprocess is shown as-being reduced in diameter Without varying the thickness of the walls, by passage between the cross rolls,

without the use of a mandrel. In Fig. 11, the tube is passed back betweencross rolls 2,

2, and over a point d on the end of mandrel bar 61 providing a finishing pass for smoothing the Walls and reducing them to the desired gage. Other operations and treatments will readily suggest themselves to those skilled in the art.

blank-in the guide trough 56, when bar 61 and pusher 60 are then advanced, forcing the blank bet'weenthecross rolls, they having being located at the properposition for engaging and feeding in the blank to carry it over the piercing point, produce the rough tube, thus performing the first operation, as

The operation is carried outby placing the is usual in this art. 'The cross rolls arethen reversed in posltion, chang ng thelr inclmation with relation to each' other, but without changing their direction ofrot'ation, therolls having been adjusted,- if"desired, -so as to varytheir distanceiap'ai't to the desired degree'. The piercing p'oint and mandrel being retracted, the tube is then, by the pusher 60 at the other-sideof the pass,'reve'rs'ed in direction andre-introducediby' its last treated endbetween the crossrolls for further op,- eration, the tube-'in-process beingthus treated successively back and forthnntil ready for the'finishing pass. A finishing "point may be then mounted on the end of'bar 61, 8

depending on the desired finish and intended work'of' the tube, "which may thus be either expandedor reduced in diameter, which op-.

eration may be'repeated, either with or. with- I homogeneity.

It will be understood that the tube'may,

desired, be re-heated at any stage of the operation.

The construction, design, proportions or. other features of the invention may be .vari-l ously changed or modifiedby the skilled mechanic to adapt it to the particular Work. in

hand or to meet. any varying conditions, of

application,- withinthe scope of theappended claims. Having claim is:' 1. In a tube rolling mill, a pair of continuously operable cross rolls, a tilting frame for each cross roll having journal; bearings therefor, and simultaneously. operable gear- 111g operatively connecting said :tilting frames for alternating their, relative posi 1 time together.

2, In a tube rolling mill, a pair' of continudescribed. my invention, I I,

p i I ou's'lyoperable cross rolls, means for alternat ng their relative positions, -and means for re-introducing ablank by its last treated I end to the crossrolls.

3. Ina tube rolling mill, a pair of continu-i ous ly operable cross rolls, a .tilting frame for each cross roll having journal bearings 'therefor, simultaneously operable ,gearing1 operatively connecting said tilting frames for alternating their relative positions, and

' from each t ative conne o 1 4. "In a tube-roll ing mill, a pair of continu- "ou sly'operablecross rolls, a tilting vframe for eachcross-roll having journal bearings there for, simultaneously operable gearing operativelyIconnecting'said tilting frames for alternatingtheir relative positions, and means for. guiding and forcibly introducing a blank 'betweenthe cross r'olls endwise alternately in oppositedirections, I

5. In a tube rolling mill, a pair of continuously operablecross rolls, means for alternating their relative positions, means at one, side for guiding and introducing a blank between thecross rolls, and means beyond the cross rolls for imparting reversing endwise movement of the blankand re-introducing it to the cross rolls during reversing'voperation thereof.

6. In a tube rolling mill, a pair of con tinuously operable cross rolls, means for continuously driving the cross rolls in the same direction during varying v positions thereof, means for alternately tilting the cross rolls in opposite directions, and means for introducing a blank to the cross rolls in correspondingly opposite directions.

- 7. In. a tube'rolling mill, a pair 0fcon-' tinuously' operable cross rolls, a' tilting frame for, each cross roll and a slidable frame for each tilting frame, means for adjusting each slidable frame, tilting frame and cross roll toward or from the other, means for applying confining pressure to the blank between the rolls, actuating gearing for tilting the'cross roll frames movable therewith, and a driving shaft in sliding engagement with said. gearing.

-8. In a tube rolling mill, a pair of continuously operable. cross rolls, a tilting frame for each cross roll and a slidable frame for each tilting frame, means for adjusting each slidable frame, tilting frame and cross roll toward or from the other, 0pposing bearingmembersembodying an ad justable roll having a middle bearing face and oppositely extending tapered portions for applying confining pressure to the blank between the rolls, actuating gearing for tilting the cross roll frames movable therewith, .and a driving shaft in sliding engagement with said gearing.

9. In a tube rolling mill, a'pair of cross rolls each arranged at an opposing angle to the other and to an intervening line corresponding to the normal line of travel of the blank and adapted to .subject the blank to I external compression and feeding action, 1 co-acting means. for alternately varying the positions'of the cross rolls together andfor reducing the distance between them wherebyto alternate the longitudinal travel and compression of the blank, and means for reintroducing. a blank by its last treated end to the cross rolls.

10. In, a tube rolling milhmeans for subjecting .a blank to-oppositely exerted external reducing pres'sure .and diagonally disposed feeding pressure, means for alternate'ly varying thedirection of the feeding pressure at each side simultaneouslywhereby to compress the blank successively. in opposite directions, and means for corre spondingly re-introducing a blank by its last treated end to the cross rolls.

11. Ina tube rolling mill, means for. sub

jecti'ng a blank to internal resisting pres-.

sure and to oppositely exerted external reducing pressure and diagonally disposed feeding pressure, meansv for alternately varying-the direction of the feeding pres sure at each side'simultaneously wherebyto compress the blank successively in opposite directions, and means. for correspondingly re-introducing a blank by its last treated end to the cross rolls.

12. In a tube rolling mill, means for sub jecting a blank to oppositely exerted hexternal reducing pressure and diagonally is-' posed feeding pressure, means for alternately varying the direction of-the feeding pressure whereby to compress the blank successively in opposite directions, and-means" for guiding and forcibly introducing the blank alternately in opposite directions to said .means.

a 13. A tube rolling 'mill provided with a pair of cross rolls each having a tilting frame, means for tilting said frames simultaneouslyin opposite directions embodying a driving shaft in sliding engagement therewith, and means for continuously driving each of the cross rolls in the same direction;

-14. A tube rolling mill provided with a gearing movable with the tilting frame and pair of cross rolls each having a tilting frame, means for tilting said frames' simultaneously in opposite directions embodying gearing movable with the tilting frame and a driving shaft in sliding engagement therewith, means for adjusting each frame and roll toward or from the other, and means for continuously driving each of the cross rolls in thesame direction. Y

15. A tube rolling mill provided with a pair of cross rolls each having a tilting frame, means for tilting said frames simultaneously in oppos te dlrections, means for adjusting each'frame and roll toward or from the other, means for continuously driving each ofthe cross rolls in thevsame direction, and means for applying confining pressure to a blank-between the cross rolls, and means for re-introducing a blank by its last treated end tothe cross rolls.

16. A tube rolling mill provided with a pair of cross rolls each having a tilting frame, means fortilting said frames simul- 'taneously in opposite directions, means for whereby to re-introduce a blank by its last 1 treated end to the cross rolls.

17. In a tube rolling -mill, a housing frame, a slidably mounted frame therein at each side of the working pass of the milha tilting frame having a rocking bearing in each of said frames, a reducing cross roll journaled in each tilting frame, gearing for adjusting each slidable frame and the tilting frame toward or from the other, gearing for simultaneously actuating both tilting frames in opposite directions, .and means for maintaining driving engagement with each cross roll throughout its varymg-positions embodying a driving shaft in sliding engagement with the gearing for the tilting frames.

18. In combination with the cross rolls having the axes disposed in the same general direction and their supporting and adjusting mechanism; assembled actuating caring, and substantially parallel spindles aving universal'joint connections with said assembled gearing and the cross rolls.

-19. In combination with the cross rolls having the akes disposed in the same general direction and their supporting andadjusting mechanism; assembled actuating gearing, and substantially parallel spindles having universal joint connections with said assembled gearing and the cross rolls and counterweighted supporting mechanism for the spindles.

20. In combination with the cross rolls having the axes disposed in the same general direction and their supporting and adjusting mechanism; assembled actuating gearing, and substantially parallel spindles having universal joint connections with said assembled gearing and the cross rolls, a guide trough located between said spindles, a

pusher bar in alinement with said guide grough, and means for actuating said pusher 21., In a tuberolling mill, a housing frame, a slidably mounted frame therein at each side of the working pass of the mill, a tilting frame having a rocking bearing in each of said frames, a reducingcross roll journaledin each tilting, frame, an adjustable bearing roller at one side of the work:

ingpass betweenthe cross rolls, gearing for actuating the slidable frame and bearing roller respectively provided-with disconnecting clutch mechanism, gearing for actuating eachtilting frame in opposite directions, and means for driving the cross rolls.

22. In a tube rolling mill of the class described, the combination with the cross rolls, tilting frames therefor, slidable frames carrying the rocking frames, a bearing anvil, and an adjustable bearing roller opposing the anvil, of a motor geared with the slid; i

able frames and with the bearing roller, motor geared with the tiltmg frames adapt; ed to maintain actuating engagement therewith at their varying positions, and means for driving the cross rolls.

23. In a tube rolling mill of'the class described, tlie combination with the cross rolls, tilting frames therefor, slidable frames carrying the tilting frames, a bearing anvil,

.and .an adjustable bearing roller opposing the anvil, of gearing for actuating the slidable frames, a motor geared with the slidable frame gearing and with the bearing roller, clutch mechanism adapted to connect and disconnect said motor with the slidable frame gearing, a motor geared with.

back and forth, means for tilting the roll frames simultaneously embodying driving gearing movable with the tilting frames and a driving shaft in sliding engagement therewith, and means for limiting the tilting movement of the roll frames.

25. In a tube rolling mill of the class described, a pair of oppositely arranged slidable frameseach havinga trunnion bearing and a supporting bearing, a tilting roll frame journaled in the trunnion. bearing of each slidable frame having a lower bearing portion engaging the supporting bearing of the slidable frame and having gear teeth, a driven roll journaled in each tilting roll frame, means for propelling each slidable frame back and forth, and means for tilting each rollaframe consisting of a worm engaging said teeth, a driving and a driven bevel gear therefor, and a drivingshaftin slidin engagement with said bevel gear;

26. n a tube rolling mill of. the class described, a pair of oppositely arranged slida ble frames each having a trunnion bearing, a supporting bearing and lateral. limiting. abutments, a tilting. roll frame journaled in the trunnion bearing of each slidable frame having a lower ,bearing portion engaging, the supporting bearing of the slidablev frame and lateral bearings-adapted to'engage said abutments, a driven roll journaled in each tilting roll frame, means for propelling each In testimoniy whereef I hereunto aflix my slidable frame badk and forth, and means signature in the presence of two Witnesses.

'i'er tilting the roll frames simultaneously v RICHARDE. BROQK. consistinggof gearing mounted to travel With- Witnesses: g 5 the slide le frames, and a driving shaft JQHN R. STOBER,

in sliding engagement therewith. WILBER E. GORDON. 

